Filter casing



Patented 22,

'UNITI-:D sTAT Es PATE NT oFFlcE mm casnvG y James W. Wilkinson, Providence, R. I., assigner to Fram Corporation, a corporationof Rhode Island Application July zo,l 1939, sei-mm. :35,415

V4 claims. (cl. zic- .cz)

This invention relatesto oil illters, and is par` lubricant conductingtube as to be strengthened against being collapsed upon tightening of the lter parts into their proper assembled position.

Another object of the invention is to provide a center lubricant conducting tube which is incapable of turning around withinthe casing when the removable cover is being tightened into a closed possition on the casing.

Another object` of the invention is to provide means integral with both the casing and the central perforated lubricant tube in which the arrangement is such that the tube is stiffened and held properly centered in position in the casing and in addition a fluid tight seal is formed between such parts. Another object of the invention is to'provide a filter embodying a casing having the center tubular'iluid conducting member and one end wall oi? the casing welded together so that the tubular member is permanently attached to the casing and ls integral therewith.

With these and other objects in view. the invention consists of cert'alnvnovel features of construction, as will be more fully described, and particularly pointed'out in the appended claims.

In the accompanying drawing:

Fig. 1 is a central longitudinal sectional View showing one form-of casing construction in accordance with the invention illustrating the illter @cartridge unit in assembled position for proper operation in the casing; y

Fig. 2 is a fragmentary `central sectional view, on enlarged scale, of the discharge end of the lllter casing illustrated in Fm. 1 showing the construction of the joints integrally uniting theI tubular conduit connector iltting to both the c as-, ing and the central perforated tube; 1

Fig. 3 is a detail fragmentary central sectional view of the bottom wall ofthe illter casing shown in Fig.. 2 showing the downwardly projecting'annular rib yto which the outside anl nular ilange of the'conduit connector fitting is- Fig. 4 is a detail fragmentary sectional view showing the central fluid conducting tube butt welded to the upper end of the tubular member of the conduit connector fitting within the casing; l

Fig. 5 is a bottom view of the illter 4casing illustrating the manner in which the l.annular flange of the conduit connector fitting' is spot welded to the exterior of the bottom wall of the lllter casing; and i Fig. 6 is a modied form ofwelded joint which nular conduit ilange to the bottom wall of .the casing.

In one common form of illter construction heretofore employed the usual central perforated tube which is located within the casing has been secured inv proper operating position therein by means of nuts disposed on` opposite sides of the bottom wall of the casing and threadingly arranged on the lower end of the tubular member which extends through a central opening` in the bottom wall of the casing. In such prior construction suitable gaskets are interposedbetween the nuts and the adjacentA surface of.y

the casing bottom so that tightening of the nuts on the tube serves to rigidly hold the tubular member securely in place while the gaskets provide an oil tight joint around the central opening in the bottom wall. A sleeve is then placed over the central perforated tubular member within the casing and rests upon thetop surface of the inside nut to provide a spacerfor -sup.

porting the usual removable i'llter cartridge above the rounded bottom wall ofthe casing when the cartridge is placed within the same. Suitable gaskets are provided atthe end openings of the heads of the illter cartridge unit which is held seated upon the lower gasket by downward movement of the cover in -being tightly drawn downover the open upper end of the casing by turning of the central clamping bolt passing through the cover and having a threaded engagement within the upper end of the central tubular discharge member.

This previous form of oil illter construction, however, has not proved entirely satisfactory since the turning movement ofthe bolt in clamping down the cover has sometimes resulted in .causing a twisting strain to be exerted on the central'tube to turn the same 'and cause it to become loose and produce a leaky joint around the opening where the lower end of the tube is .may be employed for integrally joining the an.

'secured by the nuts to the bottom wall of the casing. In anotherv instance, abig wrench exerted on the Icover securing bolt has been found to cause collapsing of the light bottom wall of the casing due to the inward movement of the -centraltubular discharge memberin being drawn Vson of annular ribs on the bottom wall o the I casing and the tting and jointed together by such welding material I provide a stiff' support for the center tube and: also reinforce the loottom wall against collapse; and the following is a more detailed description of-vthe present embodiment of this invention, illustrating the preferred means by which these advantageous results ma be accomplishedt With referenceto the drawing, i@ designates a metal casing which consists of a generally cylindrical member or shell having an outwardly bulging endl wall i2 which forms the bottom; of the casing and is of generally rounded contour and provided with a central opening I3. The other r end of the casing I is open and iscapped by a removable cover I5 to permit insertion or mth drawal of the annular iltering cartridge it from the interior of the casing. The cover t5 is'of generally arched formation and has an annular rim I'I which engages and slides over the rounded periphery of an outwardly projecting annular rib or bead I8 formed in the side wall of the casing in close proximity to its open end when the cover is drawn down on the casing by meansof the bolt I9 to press the annular gasket 2li, carried by the cover into fluid-tight sealing engagement with the 'top end face of the casing and to secure the cover to the casing. The bolt I9 extends inwardly of the casing through a central opening 2l in the cover and has screw threaded engagement within P'the upper end of the central tubular lubricant conducting member 'i2v of the lter 'so that the turning of the bolt la in order to draw down the cover I5 into sealing relation with the open end of the casing will 'also serve to compress a coiled spring 23 interposed between the inner face of the cover and an annular cork gasket 2B sealing the upper'end opening' of the lter cartridge It and the center tube 22 to apply pressure to the gasket 25 and force the cartridge I8 into oil-tight seg relation with an annular cork gasket-,26% closing the bottom end opening of the central core ofthe filter cartridge I6. In order to center the lter cartridge I6V in proper operating position in the casing I may employ suitable centering devices,

such as for -example as upwardly open cup mem,

ber 28 of the form shown, described and claimed in the copending application of Thomas E. Alda ham, for Filter cartridge mounting, filed July 20,

1939, Serial No. 285,473.

To provide a huid-tight joint for-the lower end of the center tubular *lubricant conducting member 22 in order to connect the-same with theA bottom wall of the casing, I have provided a novel conduit connector construction which consists of an' annular downwardly extending rib or corrugation 30 struck out from the bottom wall I2 of. the casing to which rib is integrally united, as by ,means of the ring of welding material l I, the upwardly extending annular rib 32 on the annular ange 33o! the conduit connector tting generally designated 35. The tting is shown as being drawn upwardly at its center so as to provide a central upwardly projecting tubular or'sleeve-like member 36 which projects inwardly within the filter casing through the central opening I3 in the bottom wall I2. The inner end face of the tubular member 3G is butt welded, as indicated at 38, to the bottom end face of the center tube 22 so that the latter, by reason of the ring of welding material ti which secures the iltting to the.

bottom wall I2 of the casing, becomes an integral part of the casing and thus is held properly centered at all times with respect thereto and also is stiiened by reason of the outside annular ilange 33 of the conduit connector iitting.

As shown in Figs. l, 2, and 4, the annular flange 33 is of a generally upwardly open dished-shape formation with upwardly extending inclined sides, which sides are bent upwardly after the application of the welding material 3l, to bring their top edges close to the bottom wall of the casing and present the eiect of continuity of its surface. The

.external end' opening of the tubular member Se is suitably threaded internally, as indicated at le, and forms the outlet for connection of the iilter to a suitable lubricant conducting conduit.-

The welded joint 3l uniting the ribs t0 and 32 together may be located either around the outside of the ribs with the ribs in butt to butt engagement, as shown in Fig. 1, or the welding material 3i may be placed between the opposed ends of the ribs as shown in' Fig. 2. If desired, a series of spot welds dit may be employed, as shown in Fig. 6, for

joining the ribs together instead of a continuous layer or ring of the welding material.

tting t5 to the bottom wall I2 of the casing, and also for attaching the center -tufbe 22 to the same.

While I have indicated above that the welded joint uniting the tubular member to the bottom and wall of the casing is exterior of the casing member, it is also to be understood that the welds attaching the tubular member to said bottom wall l together by the welding material 3| or '40 respectively.

The casing iii also is provided with an internally threaded inlet opening l2 in a portion oi' theside wall of the casing intermediate of its ends for connection of a suitable tting (not shown)v to allow A.the oil to be filtered to enter the casing Il and pass radially inwardly through the perforations inthe outer side walls of thev cartridge II, thence through the ltering material contained therein, 4 and escape through the perforations of the walls ,of the inner core ofthe lter cartridge and pass out of the casing through the center tube 22 and the outlet opening 2S.

I claim: 1 l. A casing unit for a illter comprising a shell 'open at its v'upper end. having an outwardly bulging bottom wall and a-central openingthere- 1n, a perforated center tube within the shell l In any case, the weldi or the spot welds 4U function as the sole'me'ans for securing the conduit connector asoman and extending longitudinally thereof, the upper from and projecting inwardly into the casing.

through the central opening in said bottom wall.- the top end of said tubular member within theJ shell being integrally joined with a butt welded joint to the lower end of the central perforated tubesmidbottomwallofthecasingandsaid `mllofsmidtielltel'l'illbebeingll'liivitledwlth vided with a central opening therein, a perforated center tube within the shell and extending longitudinally thereof, the upper end of said center v tube being provided with screw threads to receive a threaded cover-securing member, and means to support and nxedly retain said tube centrally of said casing and adapted to be connected to a lubricant conduit, said means consisting of a iltting having an annular ilange exannulariiangeeachhavinganannularstiifening.

rib about the central opening which ribs` project toward each other inthe .relationship ofsuch partsand arewelded to each otherto permanently connect the center tube to the cas- 2. Acasingunitforaiiltercomprising ashell open at its upper end, having a bottom wall and a` central opening therein, aV perforated center -tube Within the shell and extending longitudijthreadedcoversecuringmembenandmeans support andiixedly retain saidtubecentrally lubricant conduit, said means g of an annulariiangeexteriorofsaidcasingandexofsaid bottom. walloftheshelladiacenttothecentralopening -andatubulal' wardiy therefrom andgproiecting, inwardly into easingthroughthecentralopeninginsaid ttomwaihthetopendofsaidtubularmembeingintegrallsioinedwith buttweldediointtothelowerendofthecentube,saidilangebeingofagen formation with upwardly gather.

3. Aeasingunitforaiilter comprisingashell. openatlits upper-end, having abottom wall proteriorof the casing and extending overaI considerable portion of the outer surface of said bottom wall of the shell adjacent to the central opening, and a` tubular member integral with said flange and rising upwardly therefrom and projecting inwardly into the casing thromh the central opening in said bottom wall.- the top end of said tubular member within the shell -beingingrauyumdtotheiomendorthe central perforated tube, said bottom wall of the casingandsaid annulariiangeeachhavingan annular stiifening rib about the central opening vwhich ribs 'project toward each other in the assembled relationship of such parts and which are .secured toeach'otherbyweldingtopermanently connect said tting and the center tube to the' casing.

4. Acasingunitforanltercomprisingashell open at'its upperend.havingabottomwali pro- ,'videdwithacentralopeningthereimaperforated lntegralwith'saldnge 811111181118110" center tube withintheshelland longitudinally thereof, theupper end ofsaid center manently connect said tting and the center tube to the casing.

- JAMES W. WILKINSON. 

